1、BRITISH STANDARDBS EN 14367:2005Non controllable backflow preventer with different pressure zones Family C, type AThe European Standard EN 14367:2005 has the status of a British StandardICS 91.140.60g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g
2、59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 14367:2005This British Standard was published under the authority of the Standards Policy and Strategy C
3、ommittee on 31 October 2006 BSI 2006ISBN 0 580 47599 9National forewordThis British Standard was published by BSI. It is the UK implementation of EN 14367:2005. The UK participation in its preparation was entrusted by Technical Committee B/504, Water supply, to Subcommittee B/504/14, Backflow preven
4、tion.A list of organizations represented on B/504/14 can be obtained on request to its secretary.The UK Committee would like to comment on the following:The reader is advised to take these statements of B/504 into account when applying this standard.This publication does not purport to include all t
5、he necessary provisions of a contract. Users are responsible for its correct application.Compliance with British Standard cannot confer immunity from legal obligations.1. clause 9.2.2 specifies that all measuring instruments shall have an accuracy of 2 %, but this can be too wide compared with the t
6、olerance for the temperature of the test water;2. in Figure 3 the correct orientation of the test sample on the test rig is not given, it is assumed that the inlet end of the device is to the left hand side of the figure;3. two figures have been labelled Figure 4;4. contradictory information is give
7、n in clause 9.6.2.1, it may be assumed that a certified check valve EB conforming to EN 13959 having a closing pressure of 0,5 KPa will take precedence over any other check valve.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 2007,
8、 Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14367June 2005ICS 91.140.60English VersionNon controllable backflow preventer with different pressurezones - Family C, type ADisconnecteur zones de pression diffrentes noncontrlables - Famille C - type ASystemtrenner mit un
9、terschiedlichen nicht kontrollierbarenDruckzonen - Familie C, Typ AThis European Standard was approved by CEN on 3 February 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard
10、 without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other languag
11、e made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany
12、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centr
13、e: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14367:2005: ELicensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 14367:2005 (E) 2 Contents Page For
14、eword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 3.2 Specific use 7 4 Nominal size (denomination)7 4.1 Class a device 7 4.2 Class b device7 5 Designation 7 6 Symbolization.8 7 Physico-chemical characteristics8 7.1 Materials .8 7.2 Nature of the materials9 8 Design
15、 .9 8.1 General9 8.2 Relief valve .9 9 Characteristics and test methods10 9.1 General10 9.2 General tolerances.10 9.3 Expression of the results11 9.4 End connections11 9.5 Mechanical characteristics .11 9.6 Tightness characteristics .15 9.7 Hydraulic characteristics 18 10 Order of testing23 11 Marki
16、ng and technical documents.23 11.1 Marking .23 11.2 Technical documents 24 12 Presentation at delivery 24 Annex A (normative) Complementary test methods on backflow preventers CA class b with a plastic body25 Annex B (informative) Examples of presentation of test results28 Licensed Copy: Wang Bin, n
17、a, Tue Feb 06 06:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 14367:2005 (E) 3 Foreword This document (EN 14367:2005) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national st
18、andard, either by publication of an identical text or by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn at the latest by December 2005. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent ri
19、ghts. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Repu
20、blic, Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 200
21、7, Uncontrolled Copy, (c) BSIEN 14367:2005 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this document: 1) This document provides no information as to whether the product may be used without restric
22、tion in any of the Member States of the EU or EFTA; 2) It should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. Licensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 G
23、MT+00:00 2007, Uncontrolled Copy, (c) BSIEN 14367:2005 (E) 5 1 Scope This document specifies the: field of application; the dimensional, the physico-chemical, the design, the hydraulic, the mechanical and the acoustic characteris-tics of non-controllable backflow preventer with different pressure zo
24、nes, family C, type A, nominal sizes DN 6 to DN 50, nominal pressure PN 10. It is applicable to: Family C, type A, class “a“ for general use: devices of class “a“ shall be capable of working: at any pressure up to 1 MPa (10 bar); with any pressure variation up to 1 MPa (10 bar); at a supply temperat
25、ure limit of 65 C and 90 C for 1 h; Family C, type A, class “b“ for specific use: devices of class “b“ shall be capable of working: at any downstream pressure up to 0,3 MPa (3 bar); with any downstream pressure variation up to 0,3 MPa (3 bar); The devices of class “b“ having specific hydraulic and n
26、o acoustic requirements and are meant for equipped filling devices built-in one or two functions boilers (heating only or heating and production of sanitation hot wa-ter).It concerns boilers with a 70 kW maximum power and maximum temperature of 110C. It specifies also: test methods and requirements
27、for verifying these characteristics; marking; presentation and the delivery. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies. For undated references the latest edition of the refer
28、enced document (including any amendments) applies. EN 1254-4, Copper and copper alloys Plumbing fittings Part 4: Fittings combining other end connections with capillary or compression ends. EN 1267:1999, Valves-Test of flow resistance using water as test fluid. EN 1717:2000, Protection against pollu
29、tion of potable water in water installations and general requirements of devices to prevent pollution by backflow. EN 13959, Anti-pollution check valves - DN 6 to DN 250 inclusive Family E, Type A, B, C and D. Licensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BS
30、IEN 14367:2005 (E) 6 EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000). EN ISO 3822-1:1999, Acoustics Laboratory tests on noise emission from appliances and equipment used in water supply installations
31、 Part 1: Method of measurement (ISO 3822-1:1999). EN ISO 3822-3:1997, Acoustics Laboratory tests on noise emission from appliances and equipment used in water supply installations Part 3: Mounting and operating conditions for in line valves and appliances . EN ISO 5167-1, Measurement of fluid flow b
32、y means of pressure differential devices inserted in circular cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2003). EN ISO 6509, Corrosion of metals and alloys Determination of dezincification resistance of brass (ISO 6509:1981). ISO 7-1, Pipe threads w
33、here pressure-tight joints are made on the threads - Part 1: Dimensions, toler-ances and designation. ISO 965-1, ISO general-purpose metric screw threads - Tolerances - Part 1: Principles and ba-sic data.3 Terms and definitions For the purposes of this document, the terms and definitions given in EN
34、 1717:2000 and the following apply. 3.1 non controllable backflow preventer with different pressure zones Family C Type A the specific characteristics of this device called “CA”, are as follows: The device is divided into three zones: one upstream zone p1; one intermediate zone (pinot measurable) ve
35、nted to the atmosphere; one downstream zone p2. The device provides disconnection by venting the intermediate pressure zone to the atmosphere when the difference of pressure between the intermediate zone and the upstream zone is less than 10 % of the up-stream pressure (pi p115 or 12,5 mm2for device
36、s DN 15 no dimension being less than 4 mm. The water passage through the discharge orifice shall have a cross-section of minimal 12,5 mm2. Licensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 14367:2005 (E) 10 The smallest dimension used to calculate this cro
37、ss-section shall not be inferior to 4 mm for non-moving part. The control of the relief valve shall be of positive safety, i.e. in case of rupture or leakage, the relief shall be open. This will be checked by examination of the behaviour of the device, after dismantling the control system of the rel
38、ief valve (diaphragm, piston seal ). An air break to drain shall be placed at the discharge outlet. An air gap shall exist between any waste drain and any means to collect the discharged water (floor, tundish, curb, sink ). The device shall be capable, by design, evacuating the full relief flow rate
39、 as defined in 9.6.4 without spilling to the outside of the air break to drain. Class a device shall be equipped with: The air break to drain shall meet the dimensional requirements of chapter 9 of EN 1717:2000. This air break to drain shall be: either directly incorporated into the device; or facto
40、ry fitted; or supplied with the device. In the last two cases, the relief valve outlet of the device shall permit neither fitting of a standardized threaded pipe, nor the connection by the inside of a standardized pipe or shape, be it by glue, welding or interlocking. Class b device shall be equippe
41、d with: At least two air inlets openings with each a minimum cross-section of 12,5 mm2upstream of the relief pip-ing shall be incorporated. The smallest dimension used to calculate this cross-section shall not be less than 4 mm. A discharge construction allowing fitting of a standardized threaded or
42、 plain pipe without disturbing the working of the relief valve system and without obturating, even partially, the air inlets opening. 9 Characteristics and test methods 9.1 General Performance tests shall be carried out on the device as installed in accordance with the manufacturers tech-nical docum
43、ents. 9.2 General tolerances 9.2.1 Accuracy of measurements In the absence of any particular specifications: flow rate and pressure : 2 % of the value specified; temperature : cold water 5 K of the value specified; Licensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 2007, Uncontrolled Copy, (
44、c) BSIEN 14367:2005 (E) 11 hot water 2 K of the value specified; time: %100+of the value specified. 9.2.2 Accuracy of measuring instruments All the measuring instruments shall have an accuracy of 2 % of the measured value. 9.3 Expression of the results The measured values shall be registered. These
45、results can be expressed as a curve. See annex B for example. 9.4 End connections 9.4.1 Threaded end connections Devices with threaded connections shall be able to be dismounted without any damage to the piping. Example: coupling nut, union. 9.4.1.1 Class a device The connections shall be in conform
46、ity with EN 1254-4, EN ISO 228-1 and ISO 7-1. 9.4.1.2 Class b device The connections of the device for separate installation and for integrated purposes shall be M10 1 (in accor-dance with ISO 965-1). For integrated purposes other connections are also permitted. 9.5 Mechanical characteristics Exampl
47、es shown in the figures are for guidance only. Laboratory equipment shall be designed to ensure that the device can be tested in accordance with the requirements. 9.5.1 Mechanical resistance of the body under pressure 9.5.1.1 Requirement No visual permanent deformation or rupture of the body or the
48、internal parts of the device shall occur. The test shall be carried out under the conditions defined in 9.5.1.2. 9.5.1.2 Test method Apply at the inlet of the device, in increments of 0,1 MPa (1 bar) per 5 s, an increase of the static water pressure up to 2,5 times the PN value, this equals 2,5 MPa
49、(25 bar); Hold this pressure for 5 min. Observe the device and note any observations. Verify that the device satisfies the requirement of 9.5.1.1. Licensed Copy: Wang Bin, na, Tue Feb 06 06:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 14367:2005 (E) 12 9.5.2 Bending strength Tightness of the body 9.5.2.1 Requirement There shall be no rupture nor permanent deformation or leakage on the body of the device. The test shall be carried out under the conditions defined in 9.5.2.2. 9.5.2.2 Test meth
